1. RESEARCH ARTICLE
Elements of Morphology: Standard Terminology for the
Periorbital Region
Bryan D. Hall,1
* John M. Graham Jr.,2
Suzanne B. Cassidy,3
and John M. Opitz4
1
Department of Pediatrics, University of Kentucky, Lexington, Kentucky
2
Medical Genetics Institute, Cedars-Sinai Medical Center, David Geffen School of Medicine at UCLA, Los Angeles, California
3
Division of Medical Genetics, Department of Pediatrics, University of California–San Francisco, San Francisco, California
4
Departments of Pediatrics (Division of Medical Genetics), Pathology, Human Genetics, Obstetrics and Gynecology,
University of Utah Health Sciences Center, Salt Lake City, Utah
Received 18 September 2008; Accepted 15 October 2008
An international group of clinicians working in the field of
dysmorphology has initiated the standardization of terms used
to describe human morphology. The goals are to standardize
these terms and reach consensus regarding their definitions. In
this way, we will increase the utility of descriptions of the human
phenotype and facilitate reliable comparisons of findings among
patients. Discussions with other workers in dysmorphology and
related fields, such as developmental biology and molecular
genetics, will become more precise. Here we introduce the
anatomy of the periorbital area and define and illustrate the
terms that describe the major characteristics of the periorbital
area. Ó 2009 Wiley-Liss, Inc.
Key words: terminology; definitions; periorbital structures; eye-
brows; eyelashes; eyelids; palpebrae; telecanthus; lacrimal glands
INTRODUCTION
General
This article is part of a series of six articles defining the morphology
of regions of the human body [Allanson et al., in press-b; Biesecker
et al., in press; Carey et al., in press; Hennekam et al., in press;
Hunter et al., in press]. The series is accompanied by an introduc-
tory article describing general aspects of this project [Allanson etal.,
in press-a]. The reader is encouraged to consult the introduction
when using the definitions.
Anatomy
The general anatomy of the non-globeperiorbitalregionisdepicted
in Figure 1. The definitions for the terms utilized in describing the
features within this region are listed alphabetically. The anatomy of
the various structures is described in more detail below.
Brow: The soft tissue at the junction of the frontalis and
orbicularis oculi muscles, overlying the bony supraorbital ridge.
Eyebrow: The arch of hair on the brow (Fig. 2) [Goss, 1959]. The
eyebrows usually extend further laterally than medially, in relation
to the eye, and are wider and thicker medially. Based on observed
localized abnormalities of the eyebrow, it is useful to divide the
eyebrow into three parts: medial, middle (central), and lateral.
The hairs of the medial part are oriented laterally, while those of the
middle (central) part are oriented superolaterally. The transition
between the middle and lateral parts is less frequently visible. Some
syndromes have unique patterns of aberrations in one or more of
these three areas. The eyebrow is sometimes referred to as the
supercilium.
Eye spacing: There is wide variation in interorbital distance
and in the placement of the canthi [Cohen et al., 1995]. A number
of terms in this article address the nomenclature of these
variations. Several of the terms are commonly confused
(especially telecanthus and hypertelorism). Some of the variations
are illustrated in Figure 3.
Eyelashes: Hairs that emanate from the margins of the eyelids
[Goss, 1959].
Eyelid (syn. Blepharon, palpebra {plural: palpebrae}): A fold of
skin and its subcutaneous components that covers the anterior
globe. The upper lid is bounded by the soft tissue overlying
the inferior border of the bony supraorbital ridge and inferiorly
by the lid margin. The lower lid is bounded by the soft tissue
overlying the infraorbital rim and superiorly by the lid margin. A
Ó 2009 Wiley-Liss, Inc. 29
Note: Individuals are free to copy, distribute and display this work and to make derivative works for noncommercial purposes so long as the work is given proper attribution per the Creative Commons License 3.0. Any derivative works so
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*Correspondence to:
Bryan D. Hall, Department of Pediatrics, Division of Clinical/Biochemical
Genetics and Dysmorphology, Kentucky Clinic, University of Kentucky,
Lexington, KY 40536-0284. E-mail: bdelhall@insightbb.com
Published online 5 January 2009 in Wiley InterScience
(www.interscience.wiley.com)
DOI 10.1002/ajmg.a.32597
How to Cite this Article:
Hall BD, Graham JM Jr., Cassidy SB, Opitz
JM. 2009. Elements of morphology: Standard
Terminology for the periorbital region.
Am J Med Genet Part A 149A:29–39.

2. crescent-shaped crease on the upper eyelid represents the location
of attachment of the levator palpebrae muscle to the orbicularis
oculi muscle [Goss, 1959].
Lacrimal punctum {plural: puncta}: This structure represents
the external aperture of the tear duct system. It can be absent,
malpositioned, or obstructed [Ogawa and Gonnering, 1991], and
several terms below address these findings.
Palpebral fissure: When the eye is open the palpebral fissure is a
scaphoid space or outline formed by eyelid margins. The palpebral
fissure extends from the lateral canthus (outer canthus) to the
medial canthus (inner canthus). Many factors (e.g., size, slant,
eyelid architecture, ptosis) can contribute to configuration of the
palpebral fissures [Hall et al., 2007].
Notethatthepluralityofthetermsisvariable.Thedefaultchosen
is to specify the singular form of the term unless the term relates to a
pairofstructuresandonlymakessenseinthepluralform(e.g.,Eyes,
closely spaced) or refers to a structure with many elements
(e.g., Eyelashes, sparse). The plurality of the terms was ignored
when they were alphabetized and the terms were grouped together
(e.g., ‘‘Eye. . .’’ and ‘‘Eyes. . .’’ are grouped together, and not inter-
rupted by ‘‘Eyelashes. . .’’).
DEFINITIONS
Ablepharon
Definition: Absent eyelids (Fig. 4). objective
Comments: In Ablepharon the globe is continuously exposed
[Stevens and Sargent, 2002]. It is arguable whether true aplasia of
FIG. 1. Periorbital anatomy and terminology. A: A periorbital
image with a number of landmarks indicated. B: A
schematic diagram showing only the major periorbital
features that are commonly measured (courtesy R.
Hennekam, M.D.).
FIG. 2. Typical eyebrow with mild arch, widening medially,
and gradual thinning laterally.
FIG. 3. Visual comparison of normal eye spacing and medial
(inner) canthal position with Closely spaced eyes, Widely
spaced eyes and Telecanthus (courtesy of R. Hennekam,
M.D.). These images were artificially manipulated to
simulate clinically observed variations.
FIG. 4. Ablepharon, or absent eyelids, in a patient who also
has Telecanthus and Downslanted palpebral fissures
(courtesy of C. Stevens, M.D.).
30 AMERICAN JOURNAL OF MEDICAL GENETICS PART A

3. the eyelids exists, or whether this represents severe hypoplasia.
Nevertheless, as it is difficult or impossible to make this distinction
on clinical grounds, the term was felt to be useful.
Synonym: Absent eyelids
Ankyloblepharon
Definition: Partial fusion of the upper and lower eyelid margins by
single or multiple bands of tissue (Fig. 5). objective
Comment: This term derives from Weiss et al. [1992]. A
minimally expressed form, especially when located fully laterally,
may be more difficultto ascertain and would be a subjective feature.
A band may break and leave no evidence of its presence. Note that
this term is distinct from Cryptophthalmos.
Synonym: Eyelid synechiae; Ankyloblepharon filiforme
adnatum
Ankyloblepharon filiforme adnatum: See Ankyloblepharon
Antimongoloid slant: See Palpebral fissures, downslanted
Atrichia: See Eyelashes, sparse
Blepharochalasis
Definition: Lax, wrinkled, and baggy eyelid skin (Fig. 6). subjective
Comment: This finding is usually more apparent in the upper
eyelid. The eyelid tissue thickness is usually also reduced. The
featureisfrequentinolderpersons[HeldandSchneiderman,1990].
Blepharophimosis
Definition: A fixed reduction in the vertical distance between the
upper and lower eyelids with short palpebral fissures (Fig. 7).
subjective
Comment:ThistermisderivedfromCunniffetal.[1998].Itisan
acknowledged bundled term. When palpebral fissures are severely
shortened, they cannot be widely separated, actively or passively.
Ptosis is the term to be used when the reduction in eyelid opening is
not fixed but can be increased actively or passively. Blepharophi-
mosis is often associated with Epicanthus inversus.
Blepharoptosis: See Ptosis
Ciliary trichomegaly: See Eyebrows, long
Cryptophthalmos
Definition: Absent palpebral fissures, with skin passing continu-
ously from the forehead or eyebrow onto the cheek (Fig. 8).
subjective
Comments: This term is based on Saal et al. [1992]. This is an
acknowledged bundled term, though the separate coding of the
components (palpebral fissure absence; presence of eyelashes) was
deemed impractical. This is typically associated with a rudimentary
or small globe. Frequently, a tuft of hair accompanies the aberrant
skin
Dystopia canthorum: See Telecanthus
Ectropion
Definition: An outward turning (eversion) or rotation of the eyelid
margin (Fig. 9). subjective
FIG. 5. Ankyloblepharon, or partial fusion of the eyelids, in a
patient who also has Short palpebral fissures.
FIG. 6. Blepharochalasis, wrinkled, thin eyelids, which in
this patient is limited to the upper lids.
FIG. 7. Blepharophimosis, tight lids with short palpebral
fissures giving a pseudoptosis. This patient also has
Epicanthus inversus, which is often associated, but not
required for the finding.
FIG. 8. Cryptophthalmos secondary to skin covering the lids
and palpebral fissures (courtesy of John M. Graham,
M.D.).
HALL ET AL. 31

4. Comment: This term is derived from Cheng and Biglan [2002].
This finding is frequently associated with overexposure of the
palpebral and scleral conjunctiva and cornea. It usually involves
the lower eyelid. Modifiers such as ‘‘lower’’ and ‘‘lateral’’ may be
applied as appropriate.
Entropion
Definition: An inward turning (inversion) of the eyelid margin
(Fig. 10). subjective
Comment: The inward turned eyelid margin increases the po-
tential for mechanical irritation of the eye by eyelashes [Cheng and
Biglan, 2002]. This should be distinguished from Epiblepharon.
Epiblepharon
Definition:Redundanteyelidskinpressingtheeyelashesagainstthe
cornea and/or conjunctiva (Fig. 11). subjective
Comment: This term is based on Lemke and Stasior [1981]. This
should be distinguished from Entropion (see above).
Epicanthal fold: See Epicanthus
Epicanthus
Definition: A fold of skin starting above the medial aspect of the
upper eyelid and arching downward to cover, pass in front of and
lateral to the medial canthus (Fig. 12A). subjective
Comment: In extreme cases, the skin fold can start as high as the
eyebrow [Hall et al., 2007]. This is called epicanthus superciliaris
(Fig. 12B).
Synonym: Epicanthal fold; Epicanthus palpebralis
Epicanthus Inversus
Definition: A fold of skin starting at or just below the medial aspect
of the lower lid and arching upward to cover, extend in front of and
lateral to the medial canthus (Fig. 12C). subjective
Comment: For additional information on this finding, see [Oley
and Baraitser, 1988].
Eyes, Closely Spaced
Definition: Interpupillary distance more than 2 SD below the mean
(Fig. 13). objective OR
Interpupillary distance below the 3rd centile. objective OR
The interpupillary distance appears to be decreased. subjective
Comment: The finding is measured according to Hall et al.
[2007]. Note that the data from Hall et al. [2007] show SD for
newborns and centiles for older patients. In the latter data, there is a
continuingincreasein thismeasurementbetween 14and15years of
age, so in the objective finding cannot be made using these norms in
persons above 15 years of age. See Figure 3 for a gestalt of normal
and abnormal eye spacing.
Synonym: Hypotelorism
FIG. 9. Ectropion of the lower lid, or outward turned
(everted) lower eyelid margins. See also Figure 34.
FIG. 10. Entropion, or turned-in lower eyelids. This patient
has congenital lymphedema, but this finding is not
required for Entropion (Note that the illustration in Fig. 41
Upper eyelid fullness, is the maternal grandmother of the
patient in this figure). The patient also has Telecanthus
and Widely spaced eyes.
FIG. 11. Epiblepharon in a young boy with folded-down
upper eyelid skin, which is overlapping the palpebral
aperture. He also has Downslanted palpebral fissures.
FIG. 12. A: Epicanthus, which comprises epicanthal folds
coming from skin above the lid across and in front of
medial canthi. B: Epicanthus superciliaris, which
comprises more extensive epicanthal folds with their
origins in the eyebrow. C: Epicanthus inversus, which is
the reverse of epicanthal folds with its origin at or below
the lower eyelid margin. See also Figure 7.
32 AMERICAN JOURNAL OF MEDICAL GENETICS PART A

5. Eye, Deeply Set
Definition: An eye that is more deeply recessed into the plane of the
face than is typical (Fig. 14). subjective
Comments: This finding should be distinguished from a promi-
nent supraorbital ridge or inferior orbital margin. In Deeply set
eyes, the globe is recessed in comparison to the overall prominence
of the face. There is no known objective measurement, and diag-
nosing this feature depends heavily on the experience of the
observer.
Synonym: Sunken eyes
Eyes, Widely Spaced
Definition: Interpupillary distance more than 2 SD above the mean
(newborns 27–41 weeks gestational age Fig. 15). objective OR
Interpupillarydistanceabovethe97thcentile(0–15yearsofage).
objective OR
The interpupillary distance appears to be increased. subjective
Comment: The finding is measured according to Hall et al.
[2007]. Note that the data from Hall et al. [2007] show continuing
increase in this measurement between 14 and 15 years of age, so this
finding should only be made according to the subjective definition
in persons above 15 years of age. It is important to distinguish
between truly increased interpupillary distance and the apparently
increased spacing that is caused by Telecanthus (see that entry for
additional discussion). See Figure 3 for an illustration of variations
of eye spacing.
Synonym: Hypertelorism
Eyebrow, Broad
Definition: Regional increase in width of the eyebrow (Fig. 16).
subjective
Comment:broadeningorflaringcanbemedialorlateral,andthe
term may be modified by appending one of these words to the term
(see Fig. 16). Flaring is used to describe a widening with a change in
direction of the hairs constituting the eyebrow, but these terms are
considered synonymous here.
Synonym: Flared eyebrow
Eyebrow, bushy: See Eyebrows, thick
Eyebrow, Highly Arched
Definition: Increased height of the central portion of the eyebrow,
forming a crescent, semicircular, or inverted U shape (Fig. 17).
subjective
Comment: Most eyebrows have some arch with down turning
medially and laterally. We know of no normative data for eyebrow
arching. Identifying this feature is dependent on the experience of
the observer. It may help to closely compare the shape/arching with
that of siblings and parents.
Eyebrow, hirsutism of: See Eyebrow, thick
Eyebrow, Horizontal
Definition: An eyebrow that extends straight across the brow,
without curve (Fig. 18). subjective
FIG. 13. Closely spaced eyes, in a child. See also Figure 36.
FIG. 14. Deeply set eyes in a child.
FIG. 15. A boy with Widely spaced eyes, subjective but
without Telecanthus, demonstrating the independence of
these two features. See also Figures 10, 30, 33, and 40B.
FIG. 16. Broad medial eyebrows in a boy. In this patient, the
modifier of medial is inserted into the primary term.
FIG. 17. Highly arched eyebrows in a young man. In this
patient, the eyebrows are high-set and thin and they ride
above the supraorbital rim, although these features are
not required for the term to be used.
HALL ET AL. 33

6. Comment: Evaluation should be performed with the face at rest.
Horizontal eyebrows are an uncommon finding.
Synonym: Straight eyebrows
Eyebrow, hypertrichosis of: See Eyebrow, thick
Eyebrow, Laterally Extended
Definition: An eyebrow that extends laterally beyond the orbital
rim rather than turning gently downward at that location (Fig. 19).
subjective
Comment: The degree of extension beyond the orbital rim
considered abnormal has not been established. This feature is also
uncommon.
Eyebrow, Sparse
Definition: Decreased density/number and/or decreased diameter
of eyebrow hairs (Fig. 20). subjective
Comment: Sparseness can be regional (medial, central, lateral)
or total. These modifiers should be incorporated into the term,
when appropriate.
Synonym: Hypotrichosis of the eyebrow.
Eyebrow, straight: See Eyebrow, horizontal
Eyebrow, Thick
Definition: Increased density/number and/or increased diameter
of eyebrow hairs (Fig. 21). subjective
Comment: Thickness can be regional (medial, middle (central),
lateral) or total. These modifiers should be incorporated into the
term, when appropriate.
Synonym: Hypertrichosis of the eyebrow; Bushy eyebrow
Eyelashes, Absent
Definition: No eyelashes are present (Fig. 22). objective
Comment: This term is based on Ahmad et al. [1998]. Often this
finding is congenital and associated with alopecia universalis, but
this should be coded separately.
Synonym: Atrichia of eyelashes
Eyelashes, Long
Definition: Mid upper eyelash length >10 mm (Fig. 23). objective
OR
FIG. 18. Horizontal eyebrows, which extend straight across
from medial to lateral in this girl. See also Figure 19.
FIG. 19. Laterally extended eyebrows in a teenage boy
whoseeyebrows extendfarbeyond thelateralorbitalwall.
Healsohas Horizontal eyebrows, but thisshould becoded
separately.
FIG. 20. Sparse eyebrows in a girl with other features of
ectodermal dysplasia. See also Figure 25.
FIG. 21. Thick eyebrows, in a patient who also has
Prominent eyelashes as well. This pre-teenage boy also
shaves his facial hair.
FIG. 22. Absent eyelashes or atrichia or in an adult female.
FIG. 23. Long eyelashes, in a boy. Note that, in addition to
theirlength,theeyelashesareunusuallyangled,although
that feature is not required for the finding of Long
eyelashes. See also Figure 24.
34 AMERICAN JOURNAL OF MEDICAL GENETICS PART A

7. Increased length of the eyelashes. subjective
Comment: Measurement should be done on the longest lashes,
which are usually at the center of the lid. Normal values are
7.99 Æ 1.05 mm in boys and 7.76 Æ 1.03 mm in girls [Pucci et al.,
2005].
Synonym: Ciliary trichomegaly.
Eyelashes, Prominent
Definition: Eyelashes that draw the attention of the viewer due to
increased density and/or length and/or curl without meeting the
criteria of trichomegaly (Fig. 24). subjective
Comment: This is admittedly a bundled term, but it may be
useful in clinical practice.
Eyelashes, Sparse
Definition: Decreased density/number of eyelashes (Fig. 25).
subjective
Comment: Sometimes Sparse eyelashes are abnormally formed
eyelashes. The sparseness may be limited to one portion of the
eyelid. We know of no normative data for Sparse eyelashes.
Synonym: Hypotrichosis of eyelashes
Eyelid, Cleft
Definition: A short discontinuity of the margin of the lower or
upper eyelid (Fig. 26). subjective
Comment: The lateral segment of the lower eyelid is most
commonly involved. As the milder forms of this finding are clearly
subjective and no boundary of subjective and objective is defined,
the term is considered subjective. The term ‘‘eyelid coloboma’’ has
been replaced because the word ‘‘coloboma’’ should be used only
for defects at the site of fusion of embryologic structures, which is
notthecasehere.Modifierstodesignatethelocationofthecleftmay
be added, such as ‘‘lower’’ and ‘‘lateral.’’
Synonym: Notched eyelid
Replaces: Eyelid coloboma
Eyelid, coloboma of: See Eyelid, cleft
Eyelid, notched: See Eyelid, cleft
Hypertelorism: See Eyes, widely spaced
Hypotelorism: See Eyes, closely spaced
Hypotrichosis: See Eyebrows, sparse or Eyelashes, sparse
Infra-Orbital Crease
Definition: Skin crease extending from below the inner canthus
laterallyalongthemalarprocessofthemaxillaandzygoma(Fig.27).
subjective
Comment: This feature is often found in the presence of
hypoplasia of the malar process of the maxilla or zygoma, but this
should be described separately. See Infra-orbital fold for a related
term.
Infra-Orbital Fold
Definition: Elevated ridge(s) of skin starting well below the medial
aspect of the lower lid that curves gradually upward toward and/or
across the nasal bridge (Fig. 28). subjective
Comments: This excludes Epicanthus inversus. See Infra-
orbital crease for a related term.
Lacrimal Punctum, Absence
Definition: No identifiable superior and/or inferior lacrimal punc-
tum (Fig. 29). objective
Comments: The openings of the tear ducts are normally located
at the medial margin of each eyelid. The opening on the lowereyelid
FIG. 24. Prominent eyelashes in a boy. He also has the
finding of Long eyelashes, but that should be coded
separately. See also Figure 21.
FIG. 25. Sparse eyelashes in a girl who also has some
thinning of the lashes as well as Sparse eyebrows and
sparse scalp hair. See also Figure 26.
FIG. 26. Cleft lower, outer eyelid in a child. Note that the
modifiers of ‘‘lower’’ and ‘‘outer’’ are added to the term.
Note that she also has Sparse lower eyelashes.
FIG. 27. Infra-orbital creases in a girl who also has
Infraorbital folds, flat malar bones, and laterally
protruding ears. See also Figure 33.
HALL ET AL. 35

8. border is more visible than the opening on the upper eyelid border.
Absence of the lacrimal punctum is uncommon [Ferreira et al.,
2000]andalthoughitistypicallypresumedtobecausedbyagenesis,
we avoid causal mechanisms in this terminology. There was some
disagreement as to whether Nasolacrimal duct obstruction should
be included in this terminology. As that assessment is primarily
functional and not anatomic, it was removed.
Replaces: Agenesis of the lacrimal punctum
Lacrimal Punctum, Ectopic
Definition: Positioning of a lacrimal punctum other than at the
medial margins of the eyelid (Fig. 30). subjective
Comment:Theopeningsofthetearductsarenormallylocatedat
the medial margin of each eyelid. The opening on the lower eyelid
border is more visible than the opening on the upper eyelid border.
Ectopic positions can include the upper eyelid, nasal bridge, or
inferior to medial aspect of the lower lid.
Lagophthalmos
Definition: Inability to totally close the eyelids while awake, asleep,
or both (Fig. 31). subjective
Comment: It may be an isolated finding or part of a syndrome
[Korula et al., 1995] and can be associated with Ectropion. Lagoph-
thalmos frequently results in chronic conjunctival and/or corneal
irritation.
Mongoloid slant: See Palpebral fissure, upslanted
Palpebral Fissure, Almond-Shaped
Definition: A shape created by an acute downward arching of the
upper eyelid and upward arching of the lower eyelid, toward the
medial canthus, which gives the outline of the palpebral fissures the
configuration of an almond; thus, the maximum distance between
the fissures is offset from, and medial to, the center point (Fig. 32).
subjective
Comments: The almond configuration tends to dissipate with
time as the surrounding tissues (e.g., eyelid, nasal bridge) grow.
Palpebral Fissure, Downslanted
Definition: The palpebral fissure inclination is more than 2 SD
below the mean for age (Fig. 33). objective OR
The inclination of the palpebral fissure is less than typical for age.
subjective
Comments: The slant, or inclination, of the palpebral fissure is
defined as the angle formed by two lines: an imaginary line that
connects the lateral canthus and the medial canthus of each eye, and
an imaginary horizontal line formed by the two medial canthi when
the patient holds their head with the facial midline vertical, the head
in a neutral vertical position (neither flexed nor extended) and the
gazeforward[Farkas, 1994].Palpebralfissure inclination normsare
FIG. 28. Infra-orbital folds associated with upper facial
edema (the latter is not required for the finding to be
made). Note that these folds are oriented toward the
lateral borders of the nasal bridge. See also Figure 27.
FIG. 29. This child has Absence of the lacrimal puncta. Note
that she also has Short palpebral fissures, Downslanted
palpebral fissures, Telecanthus, and Nasolacrimal duct
obstruction with erythematous and swollen lacrimal
ducts below the medial canthi.
FIG. 30. The left eye shows an inferiorly placed medial
canthus and Ectopic lacrimal punctum plus a defect in the
left nostril.
FIG. 31. This teenage girl has Lagophthalmos, which has
caused her to have severe corneal and scleral irritation.
FIG. 32. This shows a typical Almond-shaped palpebral
fissure of the left eye. A comparison with the right eye
illustrates the difference, that being the sharp descent of
the upper medial canthal fold.
36 AMERICAN JOURNAL OF MEDICAL GENETICS PART A

9. specified in Farkas [1994] for Caucasians (pg. 283) and for Chinese
and African-American populations (limited data, pgs 342, and 349,
respectively). Hall et al. [2007] only specifies norms for Caucasians
between 6 and 16 years of age. Note that the mean inclination is
slightly upslanting at all ages [Farkas, 1994; Hall et al., 2007]. Some
features (e.g., Ptosis or Epicanthus) may hinder palpebral fissure
inclination assessment. Malar and/or zygomatic hypoplasia and
Widely spaced eyes may be associated with a downward slant.
Replaces: Antimongoloid slant
Palpebral Fissure, Long
Definition: Distance between the medial and lateral canthi is more
than 2 SD above the mean for age (Fig. 34). objective OR
Apparently increased length of the palpebral fissures. subjective
Comment: Measurement techniques and norms are as specified
in Hall et al. [2007] and Farkas [1994]. The term ‘‘wide palpebral
fissure’’ is discouraged because this term is vague with respect to
which dimension (vertical vs. horizontal) it refers to, coupled with
the popular definition of ‘‘wide-eyed,’’ which refers to palpebral
fissure height.
Replaces: Wide palpebral fissure
Palpebral Fissure, Short
Definition: Distance between the medial and lateral canthi is more
than 2 SD below the mean for age (Fig. 35). objective OR
Apparently reduced length of the palpebral fissures. subjective
Comments:Measurementtechniquesandnormsareasspecified
in Hall et al. [2007] and Farkas [1994]. These sources include more
complete data for Caucasians than for other groups. Decreased
palpebral fissure length may beaccompaniedby adecreased vertical
distance between the upper and lower eyelid, which gives the eyes a
more slit-like appearance and may give the appearance of Ptosis,
but this should be coded separately if it is present. Severe shortening
of the palpebral fissures leads to Blepharophimosis.
Palpebral Fissure, Upslanted
Definition: The palpebral fissure inclination is more than 2 SD
above the mean for age (Fig. 36). objective OR
The inclination of the palpebral fissure is greater than typical for
age. subjective
Comments: The slant, or inclination, of the palpebral fissure is
defined as the angle formed by two lines: an imaginary line that
connects the lateral canthus and the medial canthus of each eye, and
an imaginary horizontal line formed by the two medial canthi when
the patient holds their head with the facial midline vertical, the head
in a neutral vertical position (neither flexed nor extended) and the
gazeforward[Farkas, 1994].Palpebralfissureinclination normsare
specified in Farkas [1994] for Caucasians (pg. 283) and for Chinese
and African-American populations (limited data, pgs 342, and 349,
respectively). Hall et al. [2007] only specifies norms for Caucasians
between 6 and 16 years of age. Upslanted palpebral fissures may be
associated with microcephaly, but this should be coded separately.
Some features (e.g., Ptosis or Epicanthus) may hinder palpebral
fissure inclination assessment.
Replaces: Mongoloid slant
Palpebral fissure, wide. See: Palpebral fissure, long
Proptosis
Definition: An eye that is protruding anterior to the plane of the
face to a greater extent than is typical (Fig. 37). subjective
FIG. 33. This boy has Downslanted palpebral fissures,
Widely spaced eyes, Proptosis, and Infra-orbital creases.
See also Figures 4, 11, 29, 38, and 39.
FIG. 34. Long palpebral fissures, and Lateral ectropion are
obvious in this boy.
FIG. 35. Young female with mildly to moderately Short
palpebral fissures. Note some mild Ptosis. See also
Figures 5 and 29.
FIG. 36. Upslanted palpebral fissures, in a boy who also has
Closely spaced eyes. See also Figure 41B.
HALL ET AL. 37

10. Comments: This finding should be distinguished from under-
development of the supraorbital ridge or maxilla/zygoma. In
Proptosis, the globe is anteriorly protuberant in comparison to
the overall plane of the face. There is no known objective measure-
ment, and diagnosing this feature depends heavily on the experi-
ence of the observer.
Synonym: Prominent eyes
Ptosis
Definition:Theuppereyelidlidmarginispositioned3mmormore
lowerthanusualandcoversthesuperior portionoftheiris(Fig.38).
objective OR
Theupperlidmargin obscuresatleastpartofthepupil.subjective
Comment: True ptosis usually occurs in the presence of normal
palpebral fissure length. Apparent ptosis is seen in Blepharophi-
mosis and other causes of Short palpebral fissures. Pseudoptosis
occursinthepresenceofseverezygomaticunderdevelopmentwhen
the resulting dramatic downward eye slant pulls the upper eyelid
diagonally across the globe.
Synonym: Blepharoptosis
Synechiae: See Ankyloblepharon
Synophrys
Definition:Meetingofthemedialeyebrowsinthemidline(Fig.39).
subjective
Comment: Cosmetic hair removal or shaving may obscure this
feature. It is controversial whether the medial eyebrows must meet
in the midline to warrant this descriptor, as opposed to eyebrows
that extend markedly toward the midline but do not meet.
Replaces: Unibrow
Telecanthus
Definition: Distance between the inner canthi more than 2 SD
above the mean (Fig. 40). objective OR
Apparently increased distance between the inner canthi.
subjective
Comments: Telecanthus may be present without (Fig. 40A) or
with(Fig.40B)Widelyspacedeyes.Inthelattercase,Widelyspaced
eyes should be coded separately. Inner canthal distance varies
among ethnic groups. Norms are available for American Africans
[Murphy and Laskin, 1990], Chinese [Wu et al., 2000], and
Caucasians [Laestadius et al., 1969; Feingold and Bossert, 1974;
Merlob et al., 1984; Evereklioglu et al., 2001]. In the presence of an
Epicanthal fold, ascertainment of inner canthal distance can be
difficult.
Synonym: Dystopia canthorum
Unibrow: See Synophrys
Upper Eyelid, Fullness of
Definition: Swelling or distention of the upper eyelid (Fig. 41).
subjective
FIG. 37. Bilateral Proptosis. This is a duplicate of Figure 33.
FIG. 38. Ptosis of the right eyelid. Note that the upper lid
margin partially covers the right pupil (compare with
normal left upper eyelid). She also has Downslanted
palpebral fissures. See also Figure 35.
FIG. 39. A patient with Synophrys and Downslanted
palpebral fissures.
FIG. 40. A: Telecanthus with normal interpupillary distance.
Note lack of adequate visualization of the sclera toward
the medial canthi. B: Telecanthus with Widely spaced
eyes. See also Figures 4, 10, 15, and 29.
38 AMERICAN JOURNAL OF MEDICAL GENETICS PART A

11. Comment: The swelling can be due to edema, fat or other
depositions or inflammation. It is controversial whether there
should be a separate term for fullness of the lateral upper eyelid.
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FIG. 41. A: Adult female with Upper eyelid fullness. In this
case, the patient had eyelid edema which gives it fullness
and which can invert the lids causing eye irritation. B:
Localized Upper lateral eyelid fullness in a child who also
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HALL ET AL. 39